Tuning Cars in Nitro Nation android

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I am very new to these drag racing games and I am curious about tuning cars. From tuning I mean adjusting gear ratios and final drive ratios. I don't know what they are for so can someone explain it to me? Would be a great help.
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How do you tune in Nitro Nation?
Creative Mobile has released a new Nitro Nation game onto Android a few days ago called Nitro Nation Stories. Unlike the first Nitro Nation game, which was an online title, this new one is an offline game that players can partake in.Is Nitro Nation offline?
You can use the Mechanic to trade in your cars. The Mechanic appears when you reach the 3rd career level. Tap Home -> Mechanic (Tools icon) -> Trade car -> Select Car -> Trade In. You will get cash and a bonus item depending on the car you sell.Online Money Glitch
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Images: Kaique Rocha, Pok Rie, Kaique Rocha, Vladimir Kudinov